PARIS, Sept 2 (Reuters) - Forces loyal to Syrian President Bashar al-Assad carried out a "massive and coordinated" chemical attack on Aug. 21, according to a declassified French intelligence report released on Monday, a French government source told Reuters.

The nine-page document - issued by external and military intelligence services and to be presented to lawmakers later on Monday - lays out five points that suggest Assad was behind the attacks. "This poses a major threat to national and global security," the source said.